Collective.collectionfilter portlet disappearing [SOLVED]

I am upgrading a site and I wanted to add collective.collectionfilter to it.

For some reason, the portals disappear (or more precisely: some of it disappears) after selecting.

The add-on works if I add a new Plone site on the same Zope, and as far as I can tell: with the same add-ons.

Changing theme (to barcelona) and view of the collection does not help.

Any suggestion on how to troubleshoot this?

(Re)running the barceloneta profile fixed it.

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